./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.05.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.05.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 27587b975a36272f97d565edc796c457ff04a64b538fe9933b800d0dda8dcceb --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:24:02,959 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:24:03,033 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:24:03,039 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:24:03,040 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:24:03,070 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:24:03,071 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:24:03,072 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:24:03,072 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:24:03,073 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:24:03,074 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:24:03,074 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:24:03,075 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:24:03,076 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:24:03,076 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:24:03,077 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:24:03,077 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:24:03,078 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:24:03,081 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:24:03,082 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:24:03,083 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:24:03,083 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:24:03,084 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:24:03,087 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:24:03,087 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:24:03,090 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:24:03,091 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:24:03,092 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:24:03,092 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:24:03,092 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:24:03,093 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:24:03,094 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:24:03,094 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:24:03,095 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:24:03,096 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:24:03,096 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:24:03,096 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:24:03,097 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:24:03,097 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:24:03,097 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:24:03,098 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:24:03,098 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:24:03,098 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:24:03,099 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:24:03,099 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:24:03,100 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:24:03,100 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:24:03,100 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 27587b975a36272f97d565edc796c457ff04a64b538fe9933b800d0dda8dcceb [2023-11-23 21:24:03,336 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:24:03,358 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:24:03,361 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:24:03,362 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:24:03,363 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:24:03,364 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/combinations/Problem05_label45+token_ring.05.cil-2.c [2023-11-23 21:24:06,560 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:24:07,241 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:24:07,242 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/sv-benchmarks/c/combinations/Problem05_label45+token_ring.05.cil-2.c [2023-11-23 21:24:07,298 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/data/d4d326531/46e02ceee3d1432db52df865eea16ee4/FLAG46f596bde [2023-11-23 21:24:07,315 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/data/d4d326531/46e02ceee3d1432db52df865eea16ee4 [2023-11-23 21:24:07,324 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:24:07,326 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:24:07,332 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:24:07,332 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:24:07,338 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:24:07,339 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:24:07" (1/1) ... [2023-11-23 21:24:07,340 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ff71eee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:07, skipping insertion in model container [2023-11-23 21:24:07,341 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:24:07" (1/1) ... [2023-11-23 21:24:07,636 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:24:10,007 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/sv-benchmarks/c/combinations/Problem05_label45+token_ring.05.cil-2.c[380323,380336] [2023-11-23 21:24:10,036 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/sv-benchmarks/c/combinations/Problem05_label45+token_ring.05.cil-2.c[383339,383352] [2023-11-23 21:24:10,271 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:24:10,284 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:24:11,599 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/sv-benchmarks/c/combinations/Problem05_label45+token_ring.05.cil-2.c[380323,380336] [2023-11-23 21:24:11,606 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/sv-benchmarks/c/combinations/Problem05_label45+token_ring.05.cil-2.c[383339,383352] [2023-11-23 21:24:11,689 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:24:11,777 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:24:11,777 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:11 WrapperNode [2023-11-23 21:24:11,778 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:24:11,779 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:24:11,779 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:24:11,779 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:24:11,788 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:11" (1/1) ... [2023-11-23 21:24:11,912 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:11" (1/1) ... [2023-11-23 21:24:12,316 INFO L138 Inliner]: procedures = 54, calls = 57, calls flagged for inlining = 31, calls inlined = 31, statements flattened = 12814 [2023-11-23 21:24:12,316 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:24:12,317 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:24:12,317 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:24:12,318 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:24:12,338 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:11" (1/1) ... [2023-11-23 21:24:12,338 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:11" (1/1) ... [2023-11-23 21:24:12,409 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:11" (1/1) ... [2023-11-23 21:24:12,410 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:11" (1/1) ... [2023-11-23 21:24:12,544 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:11" (1/1) ... [2023-11-23 21:24:12,746 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:11" (1/1) ... [2023-11-23 21:24:12,795 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:11" (1/1) ... [2023-11-23 21:24:12,847 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:11" (1/1) ... [2023-11-23 21:24:12,942 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:24:12,945 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:24:12,945 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:24:12,945 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:24:12,947 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:11" (1/1) ... [2023-11-23 21:24:12,987 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:24:12,999 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:24:13,053 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:24:13,148 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:24:13,209 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:24:13,209 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2023-11-23 21:24:13,210 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2023-11-23 21:24:13,210 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-11-23 21:24:13,210 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-11-23 21:24:13,210 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2023-11-23 21:24:13,210 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2023-11-23 21:24:13,211 INFO L130 BoogieDeclarations]: Found specification of procedure error [2023-11-23 21:24:13,211 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2023-11-23 21:24:13,211 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2023-11-23 21:24:13,211 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2023-11-23 21:24:13,211 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2023-11-23 21:24:13,212 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2023-11-23 21:24:13,212 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2023-11-23 21:24:13,212 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2023-11-23 21:24:13,212 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:24:13,213 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:24:13,213 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:24:13,424 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:24:13,427 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:24:23,490 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:24:26,195 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:24:26,195 INFO L309 CfgBuilder]: Removed 9 assume(true) statements. [2023-11-23 21:24:26,198 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:24:26 BoogieIcfgContainer [2023-11-23 21:24:26,198 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:24:26,201 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:24:26,201 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:24:26,204 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:24:26,204 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:24:07" (1/3) ... [2023-11-23 21:24:26,205 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c207404 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:24:26, skipping insertion in model container [2023-11-23 21:24:26,205 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:11" (2/3) ... [2023-11-23 21:24:26,206 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c207404 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:24:26, skipping insertion in model container [2023-11-23 21:24:26,206 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:24:26" (3/3) ... [2023-11-23 21:24:26,207 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem05_label45+token_ring.05.cil-2.c [2023-11-23 21:24:26,223 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:24:26,223 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-11-23 21:24:26,323 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:24:26,330 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@64210e14, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:24:26,330 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-11-23 21:24:26,343 INFO L276 IsEmpty]: Start isEmpty. Operand has 1766 states, 1735 states have (on average 1.9671469740634007) internal successors, (3413), 1740 states have internal predecessors, (3413), 21 states have call successors, (21), 7 states have call predecessors, (21), 7 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2023-11-23 21:24:26,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-11-23 21:24:26,355 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:24:26,356 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:24:26,356 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:24:26,361 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:24:26,361 INFO L85 PathProgramCache]: Analyzing trace with hash -1724318920, now seen corresponding path program 1 times [2023-11-23 21:24:26,371 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:24:26,371 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2103861925] [2023-11-23 21:24:26,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:26,372 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:24:26,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:26,908 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:24:26,909 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:24:26,909 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2103861925] [2023-11-23 21:24:26,910 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2103861925] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:24:26,910 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:24:26,911 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 21:24:26,912 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121657044] [2023-11-23 21:24:26,914 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:24:26,920 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:24:26,920 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:24:26,968 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:24:26,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:24:26,976 INFO L87 Difference]: Start difference. First operand has 1766 states, 1735 states have (on average 1.9671469740634007) internal successors, (3413), 1740 states have internal predecessors, (3413), 21 states have call successors, (21), 7 states have call predecessors, (21), 7 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) Second operand has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 21:24:27,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:24:27,962 INFO L93 Difference]: Finished difference Result 3631 states and 7073 transitions. [2023-11-23 21:24:27,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:24:27,964 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 47 [2023-11-23 21:24:27,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:24:27,996 INFO L225 Difference]: With dead ends: 3631 [2023-11-23 21:24:27,996 INFO L226 Difference]: Without dead ends: 1864 [2023-11-23 21:24:28,007 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:24:28,013 INFO L413 NwaCegarLoop]: 3320 mSDtfsCounter, 3568 mSDsluCounter, 3248 mSDsCounter, 0 mSdLazyCounter, 618 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3568 SdHoareTripleChecker+Valid, 6568 SdHoareTripleChecker+Invalid, 632 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 618 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-23 21:24:28,015 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3568 Valid, 6568 Invalid, 632 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [14 Valid, 618 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-23 21:24:28,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1864 states. [2023-11-23 21:24:28,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1864 to 1863. [2023-11-23 21:24:28,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1863 states, 1813 states have (on average 1.9382239382239381) internal successors, (3514), 1817 states have internal predecessors, (3514), 36 states have call successors, (36), 13 states have call predecessors, (36), 12 states have return successors, (34), 33 states have call predecessors, (34), 34 states have call successors, (34) [2023-11-23 21:24:28,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1863 states to 1863 states and 3584 transitions. [2023-11-23 21:24:28,186 INFO L78 Accepts]: Start accepts. Automaton has 1863 states and 3584 transitions. Word has length 47 [2023-11-23 21:24:28,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:24:28,186 INFO L495 AbstractCegarLoop]: Abstraction has 1863 states and 3584 transitions. [2023-11-23 21:24:28,187 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 21:24:28,187 INFO L276 IsEmpty]: Start isEmpty. Operand 1863 states and 3584 transitions. [2023-11-23 21:24:28,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-11-23 21:24:28,194 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:24:28,194 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:24:28,195 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:24:28,195 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:24:28,196 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:24:28,196 INFO L85 PathProgramCache]: Analyzing trace with hash 457707900, now seen corresponding path program 1 times [2023-11-23 21:24:28,196 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:24:28,197 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1198381805] [2023-11-23 21:24:28,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:28,197 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:24:28,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:28,470 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:24:28,471 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:24:28,471 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1198381805] [2023-11-23 21:24:28,471 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1198381805] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:24:28,471 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [399592234] [2023-11-23 21:24:28,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:28,472 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:24:28,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:24:28,479 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:24:28,489 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:24:28,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:28,655 INFO L262 TraceCheckSpWp]: Trace formula consists of 562 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:24:28,663 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:24:28,736 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-23 21:24:28,736 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:24:28,737 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [399592234] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:24:28,737 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:24:28,737 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:24:28,738 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912766722] [2023-11-23 21:24:28,738 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:24:28,739 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:24:28,740 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:24:28,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:24:28,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:24:28,741 INFO L87 Difference]: Start difference. First operand 1863 states and 3584 transitions. Second operand has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:24:29,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:24:29,307 INFO L93 Difference]: Finished difference Result 2290 states and 4205 transitions. [2023-11-23 21:24:29,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:24:29,308 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 89 [2023-11-23 21:24:29,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:24:29,329 INFO L225 Difference]: With dead ends: 2290 [2023-11-23 21:24:29,330 INFO L226 Difference]: Without dead ends: 2073 [2023-11-23 21:24:29,332 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:24:29,333 INFO L413 NwaCegarLoop]: 3243 mSDtfsCounter, 3413 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3413 SdHoareTripleChecker+Valid, 3376 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 21:24:29,334 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3413 Valid, 3376 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 277 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 21:24:29,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2073 states. [2023-11-23 21:24:29,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2073 to 2067. [2023-11-23 21:24:29,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2067 states, 1977 states have (on average 1.8942842690945878) internal successors, (3745), 1982 states have internal predecessors, (3745), 64 states have call successors, (64), 25 states have call predecessors, (64), 24 states have return successors, (62), 60 states have call predecessors, (62), 62 states have call successors, (62) [2023-11-23 21:24:29,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2067 states to 2067 states and 3871 transitions. [2023-11-23 21:24:29,448 INFO L78 Accepts]: Start accepts. Automaton has 2067 states and 3871 transitions. Word has length 89 [2023-11-23 21:24:29,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:24:29,449 INFO L495 AbstractCegarLoop]: Abstraction has 2067 states and 3871 transitions. [2023-11-23 21:24:29,450 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 2 states have internal predecessors, (58), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:24:29,450 INFO L276 IsEmpty]: Start isEmpty. Operand 2067 states and 3871 transitions. [2023-11-23 21:24:29,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-11-23 21:24:29,458 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:24:29,459 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:24:29,489 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:24:29,675 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:24:29,675 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:24:29,675 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:24:29,676 INFO L85 PathProgramCache]: Analyzing trace with hash 18779006, now seen corresponding path program 1 times [2023-11-23 21:24:29,676 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:24:29,676 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2097598375] [2023-11-23 21:24:29,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:29,677 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:24:29,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:29,907 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:24:29,908 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:24:29,908 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2097598375] [2023-11-23 21:24:29,909 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2097598375] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:24:29,910 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1373559663] [2023-11-23 21:24:29,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:29,911 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:24:29,911 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:24:29,912 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:24:29,922 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:24:30,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:30,155 INFO L262 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:24:30,166 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:24:30,222 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-23 21:24:30,222 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:24:30,223 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1373559663] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:24:30,223 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:24:30,223 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:24:30,224 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466595059] [2023-11-23 21:24:30,224 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:24:30,225 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:24:30,225 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:24:30,226 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:24:30,226 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:24:30,226 INFO L87 Difference]: Start difference. First operand 2067 states and 3871 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:24:30,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:24:30,968 INFO L93 Difference]: Finished difference Result 2896 states and 5070 transitions. [2023-11-23 21:24:30,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:24:30,969 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 89 [2023-11-23 21:24:30,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:24:30,989 INFO L225 Difference]: With dead ends: 2896 [2023-11-23 21:24:30,990 INFO L226 Difference]: Without dead ends: 2475 [2023-11-23 21:24:30,993 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:24:30,994 INFO L413 NwaCegarLoop]: 3197 mSDtfsCounter, 3407 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 273 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3407 SdHoareTripleChecker+Valid, 3330 SdHoareTripleChecker+Invalid, 275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-23 21:24:30,995 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3407 Valid, 3330 Invalid, 275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 273 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-23 21:24:31,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2475 states. [2023-11-23 21:24:31,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2475 to 2467. [2023-11-23 21:24:31,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2467 states, 2299 states have (on average 1.8247063940843846) internal successors, (4195), 2306 states have internal predecessors, (4195), 118 states have call successors, (118), 49 states have call predecessors, (118), 48 states have return successors, (116), 112 states have call predecessors, (116), 116 states have call successors, (116) [2023-11-23 21:24:31,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2467 states to 2467 states and 4429 transitions. [2023-11-23 21:24:31,141 INFO L78 Accepts]: Start accepts. Automaton has 2467 states and 4429 transitions. Word has length 89 [2023-11-23 21:24:31,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:24:31,141 INFO L495 AbstractCegarLoop]: Abstraction has 2467 states and 4429 transitions. [2023-11-23 21:24:31,142 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:24:31,142 INFO L276 IsEmpty]: Start isEmpty. Operand 2467 states and 4429 transitions. [2023-11-23 21:24:31,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-11-23 21:24:31,147 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:24:31,147 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:24:31,171 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:24:31,363 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:24:31,363 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:24:31,364 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:24:31,364 INFO L85 PathProgramCache]: Analyzing trace with hash -1076809984, now seen corresponding path program 1 times [2023-11-23 21:24:31,364 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:24:31,364 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [198439460] [2023-11-23 21:24:31,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:31,365 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:24:31,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:31,599 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:24:31,599 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:24:31,599 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [198439460] [2023-11-23 21:24:31,600 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [198439460] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:24:31,600 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [323435818] [2023-11-23 21:24:31,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:31,601 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:24:31,601 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:24:31,602 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:24:31,629 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:24:31,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:31,797 INFO L262 TraceCheckSpWp]: Trace formula consists of 550 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:24:31,803 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:24:31,842 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-23 21:24:31,843 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:24:31,843 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [323435818] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:24:31,843 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:24:31,843 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:24:31,844 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790735432] [2023-11-23 21:24:31,844 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:24:31,845 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:24:31,845 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:24:31,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:24:31,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:24:31,846 INFO L87 Difference]: Start difference. First operand 2467 states and 4429 transitions. Second operand has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 2 states have internal predecessors, (55), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:24:32,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:24:32,467 INFO L93 Difference]: Finished difference Result 4084 states and 6750 transitions. [2023-11-23 21:24:32,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:24:32,468 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 2 states have internal predecessors, (55), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 89 [2023-11-23 21:24:32,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:24:32,492 INFO L225 Difference]: With dead ends: 4084 [2023-11-23 21:24:32,493 INFO L226 Difference]: Without dead ends: 3263 [2023-11-23 21:24:32,498 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:24:32,499 INFO L413 NwaCegarLoop]: 3197 mSDtfsCounter, 3416 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 273 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3416 SdHoareTripleChecker+Valid, 3330 SdHoareTripleChecker+Invalid, 275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:24:32,499 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3416 Valid, 3330 Invalid, 275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 273 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:24:32,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3263 states. [2023-11-23 21:24:32,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3263 to 3251. [2023-11-23 21:24:32,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3251 states, 2931 states have (on average 1.7301262367792563) internal successors, (5071), 2942 states have internal predecessors, (5071), 222 states have call successors, (222), 97 states have call predecessors, (222), 96 states have return successors, (220), 212 states have call predecessors, (220), 220 states have call successors, (220) [2023-11-23 21:24:32,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3251 states to 3251 states and 5513 transitions. [2023-11-23 21:24:32,685 INFO L78 Accepts]: Start accepts. Automaton has 3251 states and 5513 transitions. Word has length 89 [2023-11-23 21:24:32,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:24:32,686 INFO L495 AbstractCegarLoop]: Abstraction has 3251 states and 5513 transitions. [2023-11-23 21:24:32,686 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 2 states have internal predecessors, (55), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:24:32,686 INFO L276 IsEmpty]: Start isEmpty. Operand 3251 states and 5513 transitions. [2023-11-23 21:24:32,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-11-23 21:24:32,693 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:24:32,693 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:24:32,725 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:24:32,907 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:24:32,907 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:24:32,908 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:24:32,908 INFO L85 PathProgramCache]: Analyzing trace with hash 967925182, now seen corresponding path program 1 times [2023-11-23 21:24:32,908 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:24:32,908 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1048681941] [2023-11-23 21:24:32,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:32,909 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:24:32,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:33,049 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-23 21:24:33,049 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:24:33,050 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1048681941] [2023-11-23 21:24:33,050 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1048681941] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:24:33,050 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:24:33,050 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:24:33,051 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297072330] [2023-11-23 21:24:33,051 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:24:33,051 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:24:33,052 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:24:33,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:24:33,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:24:33,053 INFO L87 Difference]: Start difference. First operand 3251 states and 5513 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-23 21:24:33,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:24:33,719 INFO L93 Difference]: Finished difference Result 4527 states and 7340 transitions. [2023-11-23 21:24:33,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:24:33,720 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 89 [2023-11-23 21:24:33,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:24:33,748 INFO L225 Difference]: With dead ends: 4527 [2023-11-23 21:24:33,748 INFO L226 Difference]: Without dead ends: 3691 [2023-11-23 21:24:33,753 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:24:33,754 INFO L413 NwaCegarLoop]: 3271 mSDtfsCounter, 69 mSDsluCounter, 3203 mSDsCounter, 0 mSdLazyCounter, 498 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 6474 SdHoareTripleChecker+Invalid, 498 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 498 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:24:33,754 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 6474 Invalid, 498 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 498 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:24:33,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3691 states. [2023-11-23 21:24:33,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3691 to 3543. [2023-11-23 21:24:33,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3543 states, 3207 states have (on average 1.7159338946055505) internal successors, (5503), 3218 states have internal predecessors, (5503), 230 states have call successors, (230), 105 states have call predecessors, (230), 104 states have return successors, (228), 220 states have call predecessors, (228), 228 states have call successors, (228) [2023-11-23 21:24:33,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3543 states to 3543 states and 5961 transitions. [2023-11-23 21:24:33,962 INFO L78 Accepts]: Start accepts. Automaton has 3543 states and 5961 transitions. Word has length 89 [2023-11-23 21:24:33,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:24:33,965 INFO L495 AbstractCegarLoop]: Abstraction has 3543 states and 5961 transitions. [2023-11-23 21:24:33,965 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-23 21:24:33,965 INFO L276 IsEmpty]: Start isEmpty. Operand 3543 states and 5961 transitions. [2023-11-23 21:24:33,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2023-11-23 21:24:33,975 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:24:33,975 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:24:33,976 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-23 21:24:33,976 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:24:33,976 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:24:33,977 INFO L85 PathProgramCache]: Analyzing trace with hash -676709825, now seen corresponding path program 1 times [2023-11-23 21:24:33,977 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:24:33,977 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1257774923] [2023-11-23 21:24:33,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:33,977 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:24:34,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:34,125 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2023-11-23 21:24:34,126 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:24:34,126 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1257774923] [2023-11-23 21:24:34,126 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1257774923] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:24:34,127 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:24:34,127 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:24:34,127 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329238932] [2023-11-23 21:24:34,127 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:24:34,128 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:24:34,129 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:24:34,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:24:34,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:24:34,130 INFO L87 Difference]: Start difference. First operand 3543 states and 5961 transitions. Second operand has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 21:24:34,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:24:34,893 INFO L93 Difference]: Finished difference Result 7264 states and 11306 transitions. [2023-11-23 21:24:34,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:24:34,894 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 119 [2023-11-23 21:24:34,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:24:34,942 INFO L225 Difference]: With dead ends: 7264 [2023-11-23 21:24:34,942 INFO L226 Difference]: Without dead ends: 5367 [2023-11-23 21:24:34,952 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:24:34,954 INFO L413 NwaCegarLoop]: 3199 mSDtfsCounter, 3406 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3406 SdHoareTripleChecker+Valid, 3332 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:24:34,954 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3406 Valid, 3332 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:24:34,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5367 states. [2023-11-23 21:24:35,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5367 to 5339. [2023-11-23 21:24:35,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5339 states, 4691 states have (on average 1.6147942869324239) internal successors, (7575), 4710 states have internal predecessors, (7575), 438 states have call successors, (438), 209 states have call predecessors, (438), 208 states have return successors, (436), 420 states have call predecessors, (436), 436 states have call successors, (436) [2023-11-23 21:24:35,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5339 states to 5339 states and 8449 transitions. [2023-11-23 21:24:35,317 INFO L78 Accepts]: Start accepts. Automaton has 5339 states and 8449 transitions. Word has length 119 [2023-11-23 21:24:35,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:24:35,319 INFO L495 AbstractCegarLoop]: Abstraction has 5339 states and 8449 transitions. [2023-11-23 21:24:35,320 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 21:24:35,320 INFO L276 IsEmpty]: Start isEmpty. Operand 5339 states and 8449 transitions. [2023-11-23 21:24:35,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2023-11-23 21:24:35,339 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:24:35,341 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:24:35,341 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-23 21:24:35,342 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:24:35,342 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:24:35,343 INFO L85 PathProgramCache]: Analyzing trace with hash 1406948987, now seen corresponding path program 1 times [2023-11-23 21:24:35,343 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:24:35,343 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [655420879] [2023-11-23 21:24:35,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:35,344 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:24:35,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:35,479 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2023-11-23 21:24:35,479 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:24:35,479 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [655420879] [2023-11-23 21:24:35,480 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [655420879] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:24:35,480 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:24:35,480 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:24:35,480 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701353654] [2023-11-23 21:24:35,481 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:24:35,481 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:24:35,482 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:24:35,482 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:24:35,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:24:35,483 INFO L87 Difference]: Start difference. First operand 5339 states and 8449 transitions. Second operand has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 21:24:36,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:24:36,546 INFO L93 Difference]: Finished difference Result 12580 states and 18730 transitions. [2023-11-23 21:24:36,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:24:36,547 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 119 [2023-11-23 21:24:36,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:24:36,636 INFO L225 Difference]: With dead ends: 12580 [2023-11-23 21:24:36,644 INFO L226 Difference]: Without dead ends: 8887 [2023-11-23 21:24:36,659 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:24:36,661 INFO L413 NwaCegarLoop]: 3224 mSDtfsCounter, 3409 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 272 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3409 SdHoareTripleChecker+Valid, 3357 SdHoareTripleChecker+Invalid, 274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:24:36,661 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3409 Valid, 3357 Invalid, 274 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 272 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:24:36,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8887 states. [2023-11-23 21:24:37,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8887 to 8835. [2023-11-23 21:24:37,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8835 states, 7579 states have (on average 1.5251352421163742) internal successors, (11559), 7614 states have internal predecessors, (11559), 838 states have call successors, (838), 417 states have call predecessors, (838), 416 states have return successors, (836), 804 states have call predecessors, (836), 836 states have call successors, (836) [2023-11-23 21:24:37,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8835 states to 8835 states and 13233 transitions. [2023-11-23 21:24:37,124 INFO L78 Accepts]: Start accepts. Automaton has 8835 states and 13233 transitions. Word has length 119 [2023-11-23 21:24:37,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:24:37,124 INFO L495 AbstractCegarLoop]: Abstraction has 8835 states and 13233 transitions. [2023-11-23 21:24:37,125 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 21:24:37,125 INFO L276 IsEmpty]: Start isEmpty. Operand 8835 states and 13233 transitions. [2023-11-23 21:24:37,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2023-11-23 21:24:37,158 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:24:37,159 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:24:37,159 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-23 21:24:37,159 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:24:37,160 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:24:37,160 INFO L85 PathProgramCache]: Analyzing trace with hash -103866291, now seen corresponding path program 1 times [2023-11-23 21:24:37,160 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:24:37,160 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [493850613] [2023-11-23 21:24:37,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:37,161 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:24:37,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:37,354 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 25 proven. 1 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2023-11-23 21:24:37,356 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:24:37,356 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [493850613] [2023-11-23 21:24:37,356 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [493850613] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:24:37,356 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [442780339] [2023-11-23 21:24:37,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:37,357 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:24:37,357 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:24:37,363 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:24:37,371 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:24:37,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:37,586 INFO L262 TraceCheckSpWp]: Trace formula consists of 714 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:24:37,594 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:24:37,652 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-23 21:24:37,659 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:24:37,660 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [442780339] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:24:37,660 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:24:37,660 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-11-23 21:24:37,660 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073983369] [2023-11-23 21:24:37,661 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:24:37,662 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:24:37,662 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:24:37,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:24:37,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:24:37,665 INFO L87 Difference]: Start difference. First operand 8835 states and 13233 transitions. Second operand has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 21:24:38,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:24:38,665 INFO L93 Difference]: Finished difference Result 14891 states and 21879 transitions. [2023-11-23 21:24:38,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:24:38,666 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 135 [2023-11-23 21:24:38,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:24:38,717 INFO L225 Difference]: With dead ends: 14891 [2023-11-23 21:24:38,718 INFO L226 Difference]: Without dead ends: 11199 [2023-11-23 21:24:38,733 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:24:38,734 INFO L413 NwaCegarLoop]: 3267 mSDtfsCounter, 84 mSDsluCounter, 3202 mSDsCounter, 0 mSdLazyCounter, 497 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 6469 SdHoareTripleChecker+Invalid, 497 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 497 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-23 21:24:38,735 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 6469 Invalid, 497 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 497 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-23 21:24:38,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11199 states. [2023-11-23 21:24:39,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11199 to 10363. [2023-11-23 21:24:39,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10363 states, 9011 states have (on average 1.526023748751526) internal successors, (13751), 9046 states have internal predecessors, (13751), 886 states have call successors, (886), 465 states have call predecessors, (886), 464 states have return successors, (884), 852 states have call predecessors, (884), 884 states have call successors, (884) [2023-11-23 21:24:39,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10363 states to 10363 states and 15521 transitions. [2023-11-23 21:24:39,193 INFO L78 Accepts]: Start accepts. Automaton has 10363 states and 15521 transitions. Word has length 135 [2023-11-23 21:24:39,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:24:39,195 INFO L495 AbstractCegarLoop]: Abstraction has 10363 states and 15521 transitions. [2023-11-23 21:24:39,195 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 21:24:39,195 INFO L276 IsEmpty]: Start isEmpty. Operand 10363 states and 15521 transitions. [2023-11-23 21:24:39,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2023-11-23 21:24:39,228 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:24:39,228 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:24:39,256 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:24:39,451 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:24:39,451 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:24:39,452 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:24:39,452 INFO L85 PathProgramCache]: Analyzing trace with hash 570010696, now seen corresponding path program 1 times [2023-11-23 21:24:39,452 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:24:39,452 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [72704879] [2023-11-23 21:24:39,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:39,452 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:24:39,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:39,647 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 23 proven. 3 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2023-11-23 21:24:39,648 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:24:39,648 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [72704879] [2023-11-23 21:24:39,648 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [72704879] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:24:39,648 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [337549797] [2023-11-23 21:24:39,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:39,649 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:24:39,649 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:24:39,650 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:24:39,667 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:24:39,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:39,882 INFO L262 TraceCheckSpWp]: Trace formula consists of 717 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:24:39,888 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:24:39,941 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 71 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-23 21:24:39,941 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:24:39,942 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [337549797] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:24:39,942 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:24:39,942 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-11-23 21:24:39,943 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682435667] [2023-11-23 21:24:39,943 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:24:39,944 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:24:39,944 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:24:39,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:24:39,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:24:39,945 INFO L87 Difference]: Start difference. First operand 10363 states and 15521 transitions. Second operand has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 21:24:41,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:24:41,058 INFO L93 Difference]: Finished difference Result 18051 states and 26527 transitions. [2023-11-23 21:24:41,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:24:41,059 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 135 [2023-11-23 21:24:41,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:24:41,117 INFO L225 Difference]: With dead ends: 18051 [2023-11-23 21:24:41,117 INFO L226 Difference]: Without dead ends: 13607 [2023-11-23 21:24:41,134 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:24:41,137 INFO L413 NwaCegarLoop]: 3296 mSDtfsCounter, 96 mSDsluCounter, 3204 mSDsCounter, 0 mSdLazyCounter, 500 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 6500 SdHoareTripleChecker+Invalid, 500 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 500 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:24:41,137 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [96 Valid, 6500 Invalid, 500 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 500 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:24:41,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13607 states. [2023-11-23 21:24:41,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13607 to 12547. [2023-11-23 21:24:41,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12547 states, 11051 states have (on average 1.5223056736946883) internal successors, (16823), 11086 states have internal predecessors, (16823), 958 states have call successors, (958), 537 states have call predecessors, (958), 536 states have return successors, (956), 924 states have call predecessors, (956), 956 states have call successors, (956) [2023-11-23 21:24:41,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12547 states to 12547 states and 18737 transitions. [2023-11-23 21:24:41,703 INFO L78 Accepts]: Start accepts. Automaton has 12547 states and 18737 transitions. Word has length 135 [2023-11-23 21:24:41,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:24:41,703 INFO L495 AbstractCegarLoop]: Abstraction has 12547 states and 18737 transitions. [2023-11-23 21:24:41,704 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 21:24:41,704 INFO L276 IsEmpty]: Start isEmpty. Operand 12547 states and 18737 transitions. [2023-11-23 21:24:41,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2023-11-23 21:24:41,746 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:24:41,746 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:24:41,774 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-11-23 21:24:41,961 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:24:41,961 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:24:41,961 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:24:41,962 INFO L85 PathProgramCache]: Analyzing trace with hash -1871584949, now seen corresponding path program 1 times [2023-11-23 21:24:41,962 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:24:41,962 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1756004024] [2023-11-23 21:24:41,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:41,962 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:24:41,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:42,129 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 22 proven. 4 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2023-11-23 21:24:42,129 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:24:42,129 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1756004024] [2023-11-23 21:24:42,130 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1756004024] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:24:42,130 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1849053059] [2023-11-23 21:24:42,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:42,130 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:24:42,130 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:24:42,131 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:24:42,159 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 21:24:42,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:42,335 INFO L262 TraceCheckSpWp]: Trace formula consists of 714 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:24:42,339 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:24:42,373 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-23 21:24:42,373 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:24:42,373 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1849053059] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:24:42,373 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:24:42,374 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-11-23 21:24:42,376 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173624613] [2023-11-23 21:24:42,376 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:24:42,377 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:24:42,377 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:24:42,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:24:42,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:24:42,379 INFO L87 Difference]: Start difference. First operand 12547 states and 18737 transitions. Second operand has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 21:24:43,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:24:43,368 INFO L93 Difference]: Finished difference Result 22531 states and 33139 transitions. [2023-11-23 21:24:43,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:24:43,369 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 135 [2023-11-23 21:24:43,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:24:43,435 INFO L225 Difference]: With dead ends: 22531 [2023-11-23 21:24:43,435 INFO L226 Difference]: Without dead ends: 16923 [2023-11-23 21:24:43,454 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:24:43,455 INFO L413 NwaCegarLoop]: 3301 mSDtfsCounter, 102 mSDsluCounter, 3204 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 6505 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:24:43,455 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 6505 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:24:43,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16923 states. [2023-11-23 21:24:44,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16923 to 15751. [2023-11-23 21:24:44,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15751 states, 14039 states have (on average 1.5162760880404587) internal successors, (21287), 14074 states have internal predecessors, (21287), 1066 states have call successors, (1066), 645 states have call predecessors, (1066), 644 states have return successors, (1064), 1032 states have call predecessors, (1064), 1064 states have call successors, (1064) [2023-11-23 21:24:44,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15751 states to 15751 states and 23417 transitions. [2023-11-23 21:24:44,289 INFO L78 Accepts]: Start accepts. Automaton has 15751 states and 23417 transitions. Word has length 135 [2023-11-23 21:24:44,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:24:44,289 INFO L495 AbstractCegarLoop]: Abstraction has 15751 states and 23417 transitions. [2023-11-23 21:24:44,289 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 21:24:44,290 INFO L276 IsEmpty]: Start isEmpty. Operand 15751 states and 23417 transitions. [2023-11-23 21:24:44,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2023-11-23 21:24:44,339 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:24:44,339 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:24:44,366 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-23 21:24:44,561 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-23 21:24:44,561 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:24:44,561 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:24:44,562 INFO L85 PathProgramCache]: Analyzing trace with hash -797953878, now seen corresponding path program 1 times [2023-11-23 21:24:44,562 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:24:44,562 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [911274293] [2023-11-23 21:24:44,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:44,562 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:24:44,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:45,369 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 12 proven. 38 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-11-23 21:24:45,370 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:24:45,370 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [911274293] [2023-11-23 21:24:45,370 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [911274293] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:24:45,371 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [93588408] [2023-11-23 21:24:45,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:45,371 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:24:45,371 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:24:45,372 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:24:45,397 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcaa89b1-97b8-49f9-8a03-d6e4be2cc2fd/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 21:24:45,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:45,604 INFO L262 TraceCheckSpWp]: Trace formula consists of 815 conjuncts, 30 conjunts are in the unsatisfiable core [2023-11-23 21:24:45,611 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:24:46,083 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 60 proven. 26 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-23 21:24:46,084 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:24:46,773 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 47 proven. 3 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-11-23 21:24:46,773 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [93588408] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:24:46,773 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1749165152] [2023-11-23 21:24:46,808 INFO L159 IcfgInterpreter]: Started Sifa with 75 locations of interest [2023-11-23 21:24:46,808 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:24:46,813 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:24:46,819 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:24:46,820 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs